I like the Schneider LS 55mm. (on a p40+) It seems to fit my type of photography, which is environmental portraiture for magazines and commercial. I tend to shoot at 2.8 to 6.3 f-stop. It handles backlight well. The glass works well with off center compositions and landscape. To my eye the image quality looks good no matter where I place the subject.

I love my 110mm LS having had an H2 and 100mm 2.2 back in the days of open platform I agree it is similar.

My other 'never sell' lens is my 50mm shift.... It has to be the best value MF lens out there, it's like the 150mm 2.8 or the 120 macro before that.... Don't whatever you do borrow, rent or test one....

Personally my favorite is the 75-150. Yes I know it's a zoom but mine is quite sharp and I enjoy the flexibility, and if I could only have one it's the only one that wouldn't limit me so much I would quit shooting. Of course i've retired from any portrait work and don't ever shoot people anymore but normally tack sharpness maybe isn't the number 1 quality one would look for in a lens when shooting this style.

My way of shooting is to find a point of view and choose lenses in accordance. I often find myself pretty locked in, standing on a cliff (to get elevated view) or just having a few centimetres to move to get around stuff in that would disturb the image. So I find zooms a blessing.

The first day I spent in Grand Teton National Park I used 31 different focal lengths, from 12 to 800 mm. The focal lengths 24, 35, 50 and 55 got most use, those were on DSLR, of course. But I really feel that zooms have a merit.

Personally my favorite is the 75-150. Yes I know it's a zoom but mine is quite sharp and I enjoy the flexibility, and if I could only have one it's the only one that wouldn't limit me so much I would quit shooting. Of course i've retired from any portrait work and don't ever shoot people anymore but normally tack sharpness maybe isn't the number 1 quality one would look for in a lens when shooting this style.